git submodule add --single-branch

I would like to do a shallow clone of a submodule like this: $ git submodule add --branch master --single-branch --depth 5 repo dir but it doesn't work. I think '--single-branch' is not yet implemented for submodules.

With the clone command it works: $ git clone --branch master --single-branch --depth 5 repo dir

Is it possible to do something like this with a submodule?

Stefan