Can a fiber run completely isolated from others? Can you spawn multiple untrusted isolated functions? I'm experimenting with this right now and there is no lan

Can a fiber run completely isolated from others? Can you spawn multiple untrusted isolated functions? I'm experimenting with this right now and there is no language that has sandboxing capabilities built-in. We need runtime that is capable of go-like routines that can be completely isolated. There shouldn't be need for containers/jails/seccomp et al.