The cap-primitives crate provides primitive sandboxing operations that
cap-std and cap-async-std are built on.
The filesystem module, fs, is known to work on Linux, macOS, and FreeBSD, and
probably can be easily ported to other modern Unix-family platforms. Ports to
Windows and WASI platforms are in development, though not yet usable.
The networking module, net, is not yet usable.