Comment 3 for bug 491777

I noticed that my files do not maintain the date of modification across my synced pc's. That is, imagine I work on file foo.dat at 14:30 and it is synced to u1. I go home, start the notebook at 18:50 and u1 synces that file it will have a new modification time saying I last changed that file at 18:50 - although I actually changed that file at 14:30.
Does this relate to this bug? And is this behavior intended? Doing the same thing in dropbox does not alter the time of last modification.