Note the "file system boundaries". What that is referring to is trying to rename a file from one drive/partition to another, not watching the rename happen on a remote system.

IE: You can't rename a file from your hard disk to a floppy disk. Just doesn't make sense. Any such rename/mv operation would be done via a (very slow) copy, then a delete.

On the other hand, if you're renaming a file on the same partition, or in this case the same directory even, then all you need to do is change the name; the physical location of the file on the media doesn't need to change, and the file contents won't be partially written at any point during that operation. You simply won't see the file until the name begins matching the string you're looking for.

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