How to create a task in a nested subfolder?

Posted on behalf of a customer. Original posting date 2015-06-25.

How to create a task under folder tree MainFolder => FirstSubfolder => FirstSubToSubFolder => TaskToBeCreated in LiquidPlanner from REST API ?

How to create a task under a main folder then sub folder then one more sub folder under the sub folder in the LiquidPlanner from REST API ?
Please send me URL and JSON data and method to be used."

I found this example in the API guide:

% curl https://app.liquidplanner.com/api/workspaces/:id/tasks -d '{"task": {"name": "learn the API”}}' -X POST

but not sure how to add folder id.

Thank you.