Git submodule from just a directory of another repository

Is it possible to create a submodule that does not link to a repository directly, but to a directory inside it?

For example, let fw.git be a framework repository, with these dirs:

|fw.git
\---|test
    |code
    |tool开发者_C百科s

I'd like to submodule the framework code, just the code directory, not other directories.

No, it's not possible. Linus intentionally made git not work like that.