All Groups a User is a member of including Nested groups
As an example, to find all the groups that "CN=John Smith,DC=MyDomain,DC=NET" is a member of, set the base to the groups container DN; for example (OU=groupsOU,DC=MyDomain,DC=NET) and the scope to subtree, and use the following filter.
(member:1.2.840.113556.1.4.1941:=(CN=John Smith,DC=MyDomain,DC=NET))
Where CN=John Smith,DC=MyDomain,DC=NET is the user's FDN and the Extensible Match Rule 1.2.840.113556.1.4.1941.
-jim