[Samba] File Rights

[weetat]

Hi all ,

   I am using Fedora core 2 and Samba 3.0 .
   I have an question regarding user right in the samba .

    For example :

  -rwxrw----  1 marvinkoh mgmt  83456 Apr 23 11:21 WX-Q-0504-8601-NLB.doc

  When a user called nicklee login to samba ,who is in the same group 
with marvinkoh , modified the doc file  , i would like the userid of 
file to be change to nick lee , as show below :

-rwxrw----  1 nicklee mgmt  83456 Apr 23 19:14 WX-Q-0504-8602-NLB.doc

Any ideas how to do this ? man smb.conf no luck.

thanks
- weetat