code: func (c *Cluster) TopContainer(id string, psArgs string) (docker.TopResult, error) {
  	node, err := c.getNodeForContainer(id)
  	if err != nil {
  		return docker.TopResult{}, err
  	}
  	result, err := node.TopContainer(id, psArgs)
  	return result, wrapError(node, err)
  }
docs: // TopContainer returns information about running processes inside a container
  // by its ID, getting the information from the right node.