Remove folder access problem from parent dir -Urgent

$acl= get-acl F:\correct # correct folder permission. 
$files= get-childItem  F:\new\sub 1\sub2\sub 3|set-acl -aclobject $acl 

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The code works only if unwanted permission exist only in Sub3 .I need exact same user permission as like  F:\correct for  F:\new\sub 1\sub2\sub . But if any un-needed permission have access to it previous folder,or parent folder, the un-wanted permissions doesn't get removed.

So,kindly help me in fixing this issue.

I need a sample help scripts where it check only required users & their corresponding persmission should exist .If it's finds any un wanted permission then it go to previous level folder and have to remove those permission.
And if the previous sub folder inherit the unwanted permission from parent folder then it should remove those from the parent folder as well.