I just tried Systemd.container. The process seemed to work well, and I can log to the container with

    $ machinectl --shell root@mycontainer

but machinectl can't clone the image

    $ machinectl clone mycontainer testclone
    Could not clone image: Operation not supported

I can export and import the image:

    $ machinectl export-tar mycontainer /var/tmp/testclone.tar.gz
    $ machinectl import-tar /var/tmp/testclone.tar.gz test-container

list-images gives does not give the same information for both images:

    $ machinectl list-images
    NAME            TYPE      RO  USAGE  CREATED                      MODIFIED
    mycontainer     directory no  n/a    n/a                          n/a     
    testclone       subvolume no  60M    Thu 2015-09-24 22:41:39 CEST n/a     

but I can clone my newly imported image:

    $ machinectl clone testclone testclone2
    $ machinectl list-images
    NAME            TYPE      RO  USAGE  CREATED                      MODIFIED
    mycontainer     directory no  n/a    n/a                          n/a     
    testclone       subvolume no  60M    Thu 2015-09-24 22:41:39 CEST n/a     
    testclone2      subvolume no  60M    Thu 2015-09-24 22:48:39 CEST n/a     

I guess "machinectl clone" does a little more than just copying the images...
