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freebsd-src
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Lots of great work by many people. But I bet this guy and his optimizations to the vfs and locking has made a significant impact.
https://github.com/freebsd/freebsd-src/commits?author=mjguzi...
I needed to look at your comment for 10 minutes before I got what you mean. So you want containers that run on any POSIX operating systems?
You can do this with ptrace() which is in POSIX, but its going to be slow for i/o heavy applications. Unfortunately POSIX doesn't provide anything else (seccomp would already be a step up). See also proot[1], gVisor[2] and User Mode Linux[3] which all use ptrace().
[1] https://github.com/termux/proot
[2] https://gvisor.dev/docs/architecture_guide/platforms/#implem...
[3] https://www.kernel.org/doc/html/v5.9/virt/uml/user_mode_linu...