code: func (s *Set) ContainsAll(values ...interface{}) bool {
  	s.RLock()
  	defer s.RUnlock()
  	for _, value := range values {
  		_, ok := s.m[value]
  		if !ok {
  			return false
  		}
  	}
  	return true
  }
docs: // ContainsAll checks if all values exist in the set.