Come to FreeBSD, we have just that - jails.
I was pretty puzzled when Docker and LXC came around as this whole new thing believed to have "never been done before"; FreeBSD had supported a very similar concept for years before security groups were added in Linux.
Jails and ezjail were stellar to make mini no-overhead containers when running various services on a server. Being able to archive them and expand them on a new machine was also pretty cool (as long as the BSD version was the same.)
Nobody with knowledge of sandboxing believed this, Virtuozzo and later OpenVZ had been on Linux for a long time after all. Virtuozzo was even from a similar time frame as FreeBSD jails (2000-ish).
The key innovation of Docker was to provide a standardized way to build, distribute, and run container images.