Only update mod-time without copying file

this trick doesn’t appear to be working in 1.36

DEBUG : rclone: Version “v1.36” starting with parameters [“rclone” “copy” “test1” “Gdrive:” “-vv” “-n”]
2017/06/26 18:36:59 INFO : Google drive root ‘’: Modify window is 1ms
2017/06/26 18:36:59 NOTICE: Google drive root ‘’: Not making directory as dry run is set
2017/06/26 18:36:59 INFO : Google drive root ‘’: Waiting for checks to finish
2017/06/26 18:36:59 DEBUG : test1: Modification times differ by -180258h32m26.859s: 2038-01-18 12:05:00 -0500 EST, 2017-06-26 22:32:33.141 +0000 UTC
2017/06/26 18:36:59 NOTICE: test1: Not updating modification time as --dry-run
2017/06/26 18:36:59 DEBUG : test1: Unchanged skipping
2017/06/26 18:36:59 INFO : Google drive root ‘’: Waiting for transfers to finish
2017/06/26 18:36:59 INFO :
Transferred: 0 Bytes (0 Bytes/s)
Errors: 0
Checks: 1
Transferred: 0
Elapsed time: 700ms
2017/06/26 18:36:59 DEBUG : Go routines at exit 5
2017/06/26 18:36:59 DEBUG : rclone: Version “v1.36” finishing with parameters [“rclone” “copy” “test1” “Gdrive:” “-vv” “-n”]

Bit of thread necromancy here, but this seems to have dropped off the radar. Last we were discussing in #1505, the issue was that a crypt overlay was involved. Does this make adding this impossible, or just something the user should have to specifically invoke via a flag?

I will reply on the issue!