option old data in `.git/FETCH_HEAD` will be overwritten.
--depth=<depth>::
- Deepen the history of a 'shallow' repository created by
+ Deepen or shorten the history of a 'shallow' repository created by
`git clone` with `--depth=<depth>` option (see linkgit:git-clone[1])
to the specified number of commits from the tip of each remote
branch history. Tags for the deepened commits are not fetched.