this is a very useful command for get users from a shared folder.
#Get the ACL on the existing folderCopy the above into a notepad, modify the "\\server\share\folder" to your location of the share and save as a *.ps1 file.
$USERACL = get-acl "\\server\share\folder"
#Show the ACL
write-host "ACL entry is "
$USERACL | format-list
Open Powershell and browse to your *.ps1 location and run it. it should give you a list BUT make sure that YOU too have permission on the share.
Alternatively after modifying share location, you can paste the commands directly in powershell and get the same results.