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* fix(mount): preserve user-set mtime through async/periodic flush (#9363) flushMetadataToFiler and flushFileMetadata both stamped time.Now() onto the entry before sending it to the filer, clobbering any mtime SetAttr had stored from utimes()/touch -m -d. The reproducer hit this ~1s after touch because the writebackCache deferred close from the prior write ran flushMetadataToFiler after the user's utimes call. Flush has no business inventing timestamps. Move the write-time stamp into Write (where it always belonged for POSIX correctness) and let flush persist whatever Write or SetAttr already put on the entry. * test(mount): tighten mtime regression test, drop tautological one - userMtime now has non-zero nanoseconds, so the *Ns assertions catch a regression that would zero the field. - Add CtimeNs assertion (was missing). - Drop TestWriteStampsEntryMtime: it duplicated the implementation it was supposed to test, so a regression in Write would not have failed it. Driving the real Write path needs a full PageWriter, which is out of scope for this fix; TestFlushFileMetadataPreservesUserMtime is the meaningful regression for #9363.