`touch` doesn't fill in nanoseconds for already-existing files

Originator:thakis
Number:rdar://FB8960652 Date Originated:
Status: Resolved:
Product: Product Version:
Classification: Reproducible:
 
% rm -f myfile
% touch myfile
% stat -f %Fm myfile
1609695671.787918115
% touch myfile
% stat -f %Fm myfile
1609695678.550313000

The 2nd `touch` (or any `touch` on files/directories that already exist) always sets nanoseconds (the last 3 digits in `stat -f %Fm` output) to 000.

Updating the mtime with e.g. `python -c 'open("myfile", "w")'` sets the nanoseconds field correctly.

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