Grunt doesn't look for node_modules in parent directory? like node does

I keep all my node_modules in the parent directory one level above the main project. Which works fine with node. But it seems grunt needs node_modules in the project directory.

Is there a way to get grunt to look in all parent directories to load whatever modules it needs?

http://runnable.com/U-xEnRK8Dhtr-eNY/output