ring.get_probe returns io_uring_probe which can be use to probe
capabilities of the current running kernel.

Ref:
https://unixism.net/loti/ref-liburing/supported_caps.html
https://github.com/axboe/liburing/blob/e1003e496e66f9b0ae06674869795edf772d5500/src/setup.c#L454