Container support is ready since year 2000 on FreeBSD while Linux needed to catch up the game and with Docker finally made it in 2013.
More here:
- https://vermaden.wordpress.com/2023/06/28/freebsd-jails-cont...
- https://vermaden.wordpress.com/2025/04/11/freebsd-jails-secu...
- https://vermaden.wordpress.com/2025/04/08/are-freebsd-jails-...