code: func (ref *Ref) ContainsMSP(msp string) bool {
  	membership, err := ref.get()
  	if err != nil {
  		logger.Debugf("Failed to check ContainsMSP, err: %s", err)
  		return false
  	}
  	return membership.ContainsMSP(msp)
  }
docs: // ContainsMSP checks if given MSP is available in the underlying reference