how to check for dirent.d_type support from shell, python or perl?

[Jim Meyering]

I'd like to skip my new strace-vs-ls --color test on any
system (OS and/or file system) that lacks dirent.d_type support.
Ideally, it'd be a tiny bourne shell, python or perl script
to tell me if calling readdir on a given directory (let's say ".")
would provide struct dirent data including usable d_type values.
[For reference, some file system types do not support that, e.g.,
reiser3 and xfs, while others do, like ext4 and tmpfs. ]

Unfortunately, so far it appears there is no way to get to
the d_type member from any of those languages.

Does anyone know a way that does not require compiling
and running a C program?

I though strace -v might help, but e.g., strace -v ls empty-dir shows
only the getdents syscalls.  No details about readdir-returned data.