code: func childAddrOf(child, parent string) bool {
  	cs := strings.Split(child, ".")
  	ps := strings.Split(parent, ".")
  	if len(ps) > len(cs) {
  		return false
  	}
  	return reflect.DeepEqual(ps, cs[:len(ps)])
  }
docs: // childAddrOf does a comparison of two addresses to see if one is the child of
  // the other.