code: func getOverlappingReplicaSets(c client.ReplicaSetInterface, rs *extensions.ReplicaSet) ([]extensions.ReplicaSet, []extensions.ReplicaSet, error) {
  	var overlappingRSs, exactMatchRSs []extensions.ReplicaSet
  	return overlappingRSs, exactMatchRSs, nil
  }
docs: // TODO(madhusudancs): Implement it when controllerRef is implemented - https://github.com/kubernetes/kubernetes/issues/2210
  // getOverlappingReplicaSets finds ReplicaSets that this ReplicaSet overlaps, as well as ReplicaSets overlapping this ReplicaSet.