Samba share with multiple groups

[Muhammad Yousuf Khan <sirtcp@gmail.com>]

my scenario is , i have two groups in active directory "Everyone" and
"admins" and i want to give everyone READ ONLY rights and on the other
hand "admins" would have FULL RIGHTS and this is going to be on one
single folder not multiple. i can only assign a single group to a
folder via "chown" command. but its not fulfilling the requirement of
mine. please help

i have just created a share with samba and samba is active directory
integrated.  below is the share details
[share]
        comment = Shared Directories
        path = /share
        valid users = admin
        read only = No
        create mask = 0775
        directory mask = 0775

Thanks,