code: func (c *container) BindMounts(volumeNames []string) []string {
  	bindMounts := []string{}
  	for _, volume := range c.Volume() {
  		parts := strings.Split(volume, ":")
  		if len(parts) > 1 && !includes(volumeNames, parts[0]) {
  			bindMounts = append(bindMounts, volume)
  		}
  	}
  	return bindMounts
  }
docs: // Volume values are bind-mounts if they contain a colon
  // and the part before the colon is not a configured volume.