code: func NewOptionsForDriver(volumeOptions, extraOptions map[string]string) (OptionsForDriver, error) {
  	options := map[string]string{}
  
  	for key, value := range extraOptions {
  		options[key] = value
  	}
  
  	for key, value := range volumeOptions {
  		options[key] = value
  	}
  
  	return OptionsForDriver(options), nil
  }
docs: // NewOptionsForDriver assemble all option parameters