[Samba] mtime truncated when queried by client

[JMinson]

samba on Raspberry pi 4b - Linux 6.1.41-v8+ aarch64 GNU/Linux

if I do a mtime on the file that gets shared I see this

Modify: 2020-10-22 09:02:16.991364753 -0400

when I do a mtime on the same file on the client (Linux) I see this

Modify: 2020-10-22 09:02:16.991364700 -0400

Is not a big deal it just caused some rsync confusion that was addressed 
by using --modify-window=1


Is this by design ?