code: func (s *Sandbox) NetNsPath() string {
  	if s.netns == nil || s.netns.Get() == nil ||
  		s.netns.Get().symlink == nil {
  		if s.infraContainer != nil {
  			return fmt.Sprintf("/proc/%v/ns/net", s.infraContainer.State().Pid)
  		}
  		return ""
  	}
  
  	return s.netns.Get().symlink.Name()
  }
docs: // NetNsPath returns the path to the network namespace of the sandbox.
  // If the sandbox uses the host namespace, nil is returned