Content-Type: text/shitpost

Subject: Only
Path: you!your-host!ultron!brain-in-a-vat!am!plovergw!plover!shitpost!mjd
Date: 2018-02-08T10:47:42
Newsgroup: news.groups.only
Message-ID: <1166a57f9512ef21@shitpost.plover.com>
Content-Type: text/shitpost

What is the difference between:

The tree only has depth 2
The tree has only depth 2
The tree has depth only 2