[Samba] subfolder level restriction

[himmat baldaniya]

hello 
I have three users u1 ,u2 and u3
I have a share named "mrt" and it has two subfolder "mrt1" and "mrt2".
what i have to do is that when u1 logs in mrt 
it should view all the contents inside mrt (including contents of its subfolderand all) 
and when u2 logs into mrt it should view mrt1 and restrict mrt2 and in same way when u3 logs into mrt ,it could access mrt2 and restrict mrt1
how should i do this ?? please Help!!!!
thankyou 		 	   		  
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