code: func (d *Driver) Remove(id string) error {
  	if id == "" {
  		return fmt.Errorf("refusing to remove the directories: id is empty")
  	}
  	d.locker.Lock(id)
  	defer d.locker.Unlock(id)
  	return system.EnsureRemoveAll(d.dir(id))
  }
docs: // Remove cleans the directories that are created for this id.