>> and there's no way st_mtime can change more than once per second
> Where do you get this idea from?
[...program...]
> In this case, the file changed and only st_mtimensec changed -
> st_mtime remained the same.

Right.

And st_mtime did not change more than once per second.  Just as Greg
asserted.  Greg didn't say "a file's modify time"; he said "st_mtime".

(Greg is, however, wrong, if "second" is taken to mean real-world
second and clock changes are permitted.)

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