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0) If we already have the ref to be fetched, "git fetch" will no longer
even be called, making this command much faster overall most of the
time.
1) By default, only print remote branches that have pushed onto the
local HEAD. If you don't do any rebasing, these correspond roughly to
"pull requests".
2) With "-r", only print remote branches that are ANCESTORS of HEAD.
These may be people you need to nag more because you are requesting
the pull from them.
As likely, they are old stale branches that you should delete.
3) With "-a", print everything.
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