How to enable apparmor stacking in Debian stretch?

From reading this:
it seems running apparmor inside the container is possible.
However, my “host” as well as “guest” is running Debian stretch and apparmor is not runnig inside the container. Is there any config option or tutorial for lxc to enable stacking? Or is there some way to confine a program inside the container against the rest of the inner system from the outside?