The following code finds all groups a given Active Directory user is member of (including nested group memberships). The code requires the ActiveDirectory module.
#requires -Module ActiveDirectory
$user = Get-ADUser -Identity $Identity
$userdn = $user.DistinguishedName
$strFilter = "(member:1.2.840.1135188.8.131.521:=$userdn)"
Get-ADGroup -LDAPFilter $strFilter -ResultPageSize 1000
To find group memberships, simply run Get-NestedGroupMember with the name of a user. The function accepts the same identity information that is accepted by Get-ADUser, so you can specify a SamAccountName, a SID, a GUID, or a distinguishedName.
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