Why does restic upload so much metadata for small, unchanged folders, e.g., `(0 B added, 659.680 KiB metadata)`?

[juice]

Maybe related to Backing up (macOS) Photos Library, especially:

@MichaelEischer

Unmodified files are just added to the backup progress without any further processing. Files that are regarded as modified but whose content are not actually modified are just reread by restic without uploading any new data to the backup repository.

I’ve had similar issue: Restic seems to consider some files changed even though the files have just been laying on the disk. @NobbZ’s hypothesis about adate sounds reasonable.