[xwiki-users] How to restrict the search visibilty of wiki user?

Hi All, I asked the below query log time before but have not got any inputs. I would be grateful if you folks have any idea about below configuration. let me know if it is possible to configure this kind of feature in xwiki in any version? i want to give rights in a way so that the users in a certain group should be able search the users of a certain group. For example i have 3 groups G1,G2,G3 . G1 contains user U1,G2 contains user U2 and G3 contains user U3. Now i want to give the the group 1 users rights in a way so that they should be able to search the G1 and G2 users only but not G3 users.Thanks