reverse: advance mtime & ctime for virtual files by 10 seconds

With inode number reuse and hard links, we could have returned
wrong data for gocryptfs.diriv and gocryptfs.xyz.longname files, respectively
(https://github.com/rfjakob/gocryptfs/issues/802).

Now that this is fixed, ensure that rsync and similar tools pick up the new
correct files by advancing mtime and ctime by 10 seconds, which should be more
than any filesytems' timestamp granularity (FAT32 has 2 seconds).

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