How to find if a user does not have permissions to their folder?

scenario: user loses permissions to their file share or user folder

goal: identify the user that has a matching username in AD but lost permissions to their folder

issues: I can find the users that have permissions to their folder and I can find other users. I am having issues when the user lost permissions to the folder and just focusing on that user and not the other ones like "administrators, users, " or common system accounts.

The scripting guy post helped me get further than my original code:
http://blogs.technet.com/b/heyscriptingguy/archive/2009/09/14/hey-scripting-guy-september-14-2009.aspx

I have numerous versions below and after a few hours am giving up for the night. Please help!

The section in bold is where I am struggling with logic to show me results of only users that have the same AD name as the folder name, but do not have permissions to that folder.

Import-Module ActiveDirectory

cls
$OutFile = "c:\scripted\share_folder_permission.csv"
Del $OutFile
$RootPath = "c:\users\"
#get-user \\FILESHARE\users\$_.$UserName
#$rootpath = "\\FILESHARE\users"

#$username='DOMAIN\MYLOGIN205'
$Folders = dir $RootPath | where {$_.psiscontainer -eq $true}
foreach ($Folder in $Folders){
$username='DOMAIN\' + $Folder.Name
$acl = Get-Acl -Path $Folder.Fullname
#$acl.Access |ForEach-Object { $_.identityReference.value | Where-Object { $_ -eq $username }}

#$acl.Access | ForEach-Object { $_.identityReference.value | Where-Object { $_ -eq $username }  } {
$acl.Access | ForEach-Object { $_.identityReference.value | Where-Object { $_ -ne $username }  } {

$adaccount = Get-QADUser $folder
if ($adaccount.accountisenabled){
 $outinfo = "user " + $username + " " + $folder.fullname + " does not have access"
Add-Content -Value $OutInfo -Path $OutFile

}
}<#if ($_.identityReference.value -eq $username){
 $outinfo = "user " + $username + " " + $folder.fullname + " has access"
 Add-Content -Value $OutInfo -Path $OutFile
} #>

#if ($_.access -ne $username){
 #$outinfo = "user " + $username + " " + $folder.fullname + " does not have access"
 #Add-Content -Value $OutInfo -Path $OutFile
#}

  #end foreach for acl loop
} #end searching folder in folders


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