powershell ftp directory creation

I have a powershell script that creates a directory based on input from the user.  The begining of the script uses a raed-host to assign a directory name to "$AccountName".  this is the portion of the code that I am using to assign permissions to the dreated directory,
#       ---Set Permissions on Folder
 
"Setting Permissions on E:\SecureFtpSite\Support\$AccountName"
 
$colRights = [System.Security.AccessControl.FileSystemRights]"Modify"
$Inherit = [System.Security.AccessControl.InheritanceFlags]"ContainerInherit, ObjectInherit"
$Propagate = [System.Security.AccessControl.PropagationFlags]::None
$objType =[System.Security.AccessControl.AccessControlType]::Allow
$User = New-Object System.Security.Principal.NTAccount("$Computer\$AccountName")
$objACE = New-Object System.Security.AccessControl.FileSystemAccessRule($User, $colRights , $Inherit, $Propagate, $objType)

$objACL = Get-Acl "E:\SecureFtpSite\Support\$AccountName"
$objACL.AddAccessRule($objACE)
 
Set-Acl "E:\SecureFtpSite\Support\$AccountName" $objACL
 
Start-Sleep -Seconds 5
 
"Permissions Successfully Applied!"

here is my issue.  the created account is in the ftp users group for the site and every account created has permission to list in every directory created.  I would like to restrict created  accounts to only be able to view directories that are created for the specific account.  Here is the code in its entirity.  everything is working with the exception of the granular level of permissions I require.  Any help would be appreciated

### PowerShell Script
### Create local User Acount
 
$AccountName = Read-Host "Please enter user account name (i.e. krisp)"
$FullName = Read-Host "Please enter the full name (i.e. Kris)"
$Description = Read-Host "Please enter the description (i.e. Krisp FTP Login)"
$Password = Read-Host "Please enter a password"
$Computer = "MYFTPSERVER"
 
"Creating user on $Computer"
 
# Access to Container using the COM library
$Container = [ADSI] "WinNT://$Computer"
 
# Create User
$objUser = $Container.Create("user", $Accountname)
$objUser.Put("Fullname", $FullName)
$objUser.Put("Description", $Description)
 
# Set Password
$objUser.SetPassword($Password)
 
# Save Changes
$objUser.SetInfo()
 
# Add User Flags
# The numbers are bitwise - 65536 is Password Never Expires ; 64 is User Cannot Change Password

$objUser.userflags = 65536 -bor 64
$objUser.SetInfo()
 
"User $AccountName created!"
" ------------------------"


 
#       ---Create FTP local directory---
 
"Creating directory E:\SecureFtpSite\Support\$AccountName"
 
New-Item E:\SecureFtpSite\Support\$AccountName -type directory  
Start-Sleep -Seconds 5
"Directory $AccountName created!"
" ------------------------"
 
 
#       ---Set Permissions on Folder
 
"Setting Permissions on E:\SecureFtpSite\Support\$AccountName"
 
$colRights = [System.Security.AccessControl.FileSystemRights]"Modify"
$Inherit = [System.Security.AccessControl.InheritanceFlags]"ContainerInherit, ObjectInherit"
$Propagate = [System.Security.AccessControl.PropagationFlags]::None
$objType =[System.Security.AccessControl.AccessControlType]::Allow
$User = New-Object System.Security.Principal.NTAccount("$Computer\$AccountName")
$objACE = New-Object System.Security.AccessControl.FileSystemAccessRule($User, $colRights , $Inherit, $Propagate, $objType)

$objACL = Get-Acl "E:\SecureFtpSite\Support\$AccountName"
$objACL.AddAccessRule($objACE)
 
Set-Acl "E:\SecureFtpSite\Support\$AccountName" $objACL
 
Start-Sleep -Seconds 5
 
"Permissions Successfully Applied!"
" ------------------------"
 
#       ---Add User to FTP Users Local Group
 
"Adding User to FTP Users Group"
 
$group = [ADSI]"WinNT://$computer/FTP Users"
$group.add("WinNT://$computer/$AccountName")
 
"User Added!"
"-------------------------"