to check the Directory Permission recursively I use

get-childitem \\abcd\E -recurse | get-acl | Format-List | Out-File "c:\temp\output.txt"

This lists the local and AD groups with access to files and folders.

I am looking for a script that can list the users in the AD groups with access to all these files/folders.

basically, you want to find the users within the AD groups?

check out this link: 

https://technet.microsoft.com/en-us/library/ee617193.aspx

Get-ADGroupMember

Gets the members of an Active Directory group.