code: func (n *ExecNode) Snapshots() (map[string][]byte, error) {
  	if n.client == nil {
  		return nil, errors.New("RPC not started")
  	}
  	var snapshots map[string][]byte
  	return snapshots, n.client.Call(&snapshots, "simulation_snapshot")
  }
docs: // Snapshots creates snapshots of the services by calling the
  // simulation_snapshot RPC method