Not a bug: does MariaDB updates mtime (*.ibd and *.frm) after each transaction?

Hello From France.

*Description*

I am using a backup tool using rsync.

Rsync "quick check" sync every file if size if different or if mtime is different.

However, it happears that files (*.ibd and *.frm) used by MariaDB are not "updated" very ofen (mtime).

I mean, data is up to date inside these files but why MariadDB doesn't update mtime of these files on each commit?

I am quite sure this is not a bug.

So, please send a "RTFM", I will be very happy! ^^