Powershell Script request: remove folder security inheritance

"users" folder on specific server share.  Random number of folders setup incorrectly up to two years ago, searching row by row too time consuming for 500+ users so I'm looking for a script that still stop inheritance and manually change a couple of the security entries.

Namely removing inheritance, adding the folders owner with full control (if they do not already exist), also removing "Authenticated Users" and/or "jak-2k3-mss/users" if they exist.

So folder named "Bsmith" current Security tab:

Administrators - Full
Authenticate Users - Modify
Domain Admins - Full
Backup Exec - Full
System - Full
Users - Modify

Changed to:

Administrator - Full
Domain Admins - Full
Backup Exec - Full
System - Full
Bsmith - Full (bsmith is also the folder name per login script if that helps)

The login script right now checks for the existence of a folder that matches the username, if none it creates one.

The folder creation part of the login script:

Sub CheckForUserFolder(UserName)
On Error Resume Next
Dim ObjFSO
Set ObjFSO = CreateObject("Scripting.FileSystemObject")
	If Not(ObjFSO.FolderExists("\\jak-2k3-mss\users\" & UserName)) Then 
		Set newfolder = ObjFSO.CreateFolder("\\jak-2k3-mss\Users\" & UserName)
	End If
End Sub

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I include that in case I've got something wrong or if there's a variable I can add that will add the user with full control during creation time.