virtiofs: file ownerships dynamically changes depending on the caller's UID

```console
suda@lima-vz:~$ whoami
suda

suda@lima-vz:~$ ls -ld /Users/suda/
drwxr-xr-x 106 suda suda 3392 Apr 27 05:04 /Users/suda/

suda@lima-vz:~$ sudo ls -ld /Users/suda/
drwxr-xr-x 106 root root 3392 Apr 27 05:04 /Users/suda/

suda@lima-vz:~$ sudo -u foo ls -ld /Users/suda/
drwxr-xr-x 106 foo foo 3392 Apr 27 05:04 /Users/suda/
```

Lima v0.15.1, macOS 13.3.1 (Intel)

Probably Apple intentionally designed this behavior, but I can't find a documentation for this.

Similar issue in Docker for Mac:
- https://github.com/docker/for-mac/issues/6243

No repository files, tests, or entry points are named. Reproduce the listed ownership checks with virtiofs, then inspect Lima's virtiofs integration and documentation; done means explaining the UID-dependent ownership behavior or defining a scoped fix with regression coverage.

Written by the indexing model from the issue text.