SetModTime kept the caller's full precision modtime in memory while
the PROPPATCH sets it on the server with second precision, so until
the object was re-read the modtime did not match what a fresh listing
would report. This broke wrappers which compare exact modtimes, such
as the hasher backend's fingerprint and the VFS cache. Truncate the
modtime to second precision to match what the server stores.
Nick Craig-Wood
d1fcbadc1f