'Returns only the containers within `container`.'

def subcontainers(self, container, filters=None, limit=None, offset=None, order_by=None, **kwargs):

    filter_to_inside_container = self._get_filter_for_contained(container, self.subcontainer_class)
    filters = base.munge_lists(filter_to_inside_container, filters)
    return self._session().query(self.subcontainer_class).filter(filters).all()
