It seems like the nano seconds that are stored in for example mtime
are snapshots of a nano second counter, taken at certain intervals,
much more seldom than one would expect.

For example, a bash script with:

echo HELLO > a.txt
do some bashy loops and echos
echo  HELLO > b.txt

at least on my btrfs/linux installation, you can do a lot of bashy
loops and stuff between
the two echos, and still a.txt and b.txt get the same nano second mtime.

Does anyone one why this is the case?

Thanks!

//Fredrik

Linux qi 4.4.0-45-generic #66-Ubuntu SMP Wed Oct 19 14:12:37 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux
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