Returns the Access Modes, per Group, that have been explicitly granted for the children
of the Container associated with the given ACL (Access Control List).
The function does not return:
Access Modes granted indirectly to the Groups through other ACL rules, e.g. public permissions.
Access Modes granted to the Groups for the Container Resource itself (see [[getGroupResourceAccessAll]] instead).
Returns the Access Modes, per Group, that have been explicitly granted for the children of the Container associated with the given ACL (Access Control List).
The function does not return: