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Capture+transmit source atime (pre-read stat; O_NOATIME sender guard) and birth time (statx STATX_BTIME); receiver restores atime with mtime (crtime not settable portably -> transmitted, explicitly not applied). --open-noatime is client-only. -O/-J documented as accepted no-ops (FastSync never preserves dir/symlink times). Wire: metadata frame gains atime/crtime val+sec+nsec; PROTOCOL_VERSION 2.11.0->2.12.0. Review fixes: gate atime capture to Linux (no epoch clobber on non-Linux), close fd on fdopen failure, honest -O/-J status (Compat no-op).