linkgit:git-clone[1]), deepen or shorten the history to the specified
number of commits. Tags for the deepened commits are not fetched.
+--shallow-since=<date>::
+ Deepen or shorten the history of a shallow repository to
+ include all reachable commits after <date>.
+
--unshallow::
If the source repository is complete, convert a shallow
repository to a complete one, removing all the limitations