pygit2: How to implement git clone --single-branch?

[leiless]

$ git clone -h
usage: git clone [<options>] [--] <repo> [<dir>]
...
    -b, --branch <branch>
                          checkout <branch> instead of the remote's HEAD
...
    --single-branch       clone only one branch, HEAD or --branch

Hi, all. git clone has an option (i.e. --single-branch) to specify only clone one branch.
Just wonder if anyone knows how to implement this functionality with pygit2?

With --single-branch, git branch -a will has only one branch, not all remote branches.

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Might be helpful:
libgit2/libgit2#2924
nodegit/nodegit#1669