Query users in a Security Group with LDAP

I have a linked server set up and working correctly. I can create a query to get all the users from active directory with something like this:

SELECT [name], [samaccountname] from OpenQuery( ADSI,
'SELECT name, samaccountname FROM ''LDAP://DC=domain,DC=com'' WHERE objectClass = ''user'' and objectCategory=''Person''')

Now I am trying to select all the users in a specifed security group, but I am not having much luck. What is the best way to get this?

Thanks much.If that can't be done, is there anyway to check if a user is a member of a group or not through a linked server?sql