Can use RBAC for grant privilege to user on specific directory or not?

If I want user "aaa:group1" to have write privilege on specific directory of user "bbb:group2" (such as /export/home/bbb).
Can I use RBAC Feature for this case? How to?
Because basic permission of Unix very large scope (user, group, other).
If I specific folder "/export/home/bbb" to rwxrwxr-x, then change group of user "aaa" to group2. Other user in group2 will have write privilege too.
Thank you.

If you want fine grain control over directory permissions than the feature you want are access control lists (acl's).
Try man setfacl, though I warn you that the documentation for acl's are pretty confusing...

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