[Samba] NTFS file property - "primary group ID" instead of DACL

[Chere Zhou]

When I change file property - security from Windows, I can see both from 
packet sniffer and Samba code, that there are 4 types of "security 
information":
	Owner ID Reference
	Primary Group ID Reference
	Discretionary ACL Reference
	System ACL Reference

So if I want to change the primary group name on a file, by right click on 
the file->property->security->advanced->select the group->view/edit->change, 
I got the "Discretionary ACL Reference" in the packet.

My question is, how do I trigger the "Primary Group ID Reference" in the 
packet?  What should I do from the client side?

Thanks,
Chere