code: func (os *OpenStack) DisksAreAttached(instanceID string, volumeIDs []string) (map[string]bool, error) {
  	attached := make(map[string]bool)
  	for _, volumeID := range volumeIDs {
  		isAttached, err := os.DiskIsAttached(instanceID, volumeID)
  		if err != nil && err != ErrNotFound {
  			attached[volumeID] = true
  			continue
  		}
  		attached[volumeID] = isAttached
  	}
  	return attached, nil
  }
docs: // DisksAreAttached queries if a list of volumes are attached to a compute instance