code: func (daemon *Daemon) setupMounts(c *container.Container) ([]container.Mount, error) {
  	var mnts []container.Mount
  	for _, mount := range c.MountPoints { // type is volumemounts.MountPoint
  		if err := daemon.lazyInitializeVolume(c.ID, mount); err != nil {
  			return nil, err
  		}
  		s, err := mount.Setup(c.MountLabel, idtools.Identity{}, nil)
  		if err != nil {
  			return nil, err
  		}
  
  		mnts = append(mnts, container.Mount{
  			Source:      s,
  			Destination: mount.Destination,
  			Writable:    mount.RW,
  		})
  	}
  
  	sort.Sort(mounts(mnts))
  	return mnts, nil
  }
docs: // setupMounts configures the mount points for a container by appending each
  // of the configured mounts on the container to the OCI mount structure
  // which will ultimately be passed into the oci runtime during container creation.
  // It also ensures each of the mounts are lexicographically sorted.
  // BUGBUG TODO Windows containerd. This would be much better if it returned
  // an array of runtime spec mounts, not container mounts. Then no need to
  // do multiple transitions.