code: func (c *Container) SetFinishedAt(finishedAt time.Time) {
  	if finishedAt.IsZero() {
  		return
  	}
  
  	c.lock.Lock()
  	defer c.lock.Unlock()
  
  	c.finishedAt = finishedAt
  }
docs: // SetFinishedAt sets the timestamp for container's stopped time