Missing DNS API : service subfolder

[hitman401]

Issue reported in dev forum

There is GET /dns/:serviceName/:longName to get info about the content of the root folder of a service
There is GET /dns/:serviceName/:longName/:filePath to get the content of a file of a service

There isn't GET /dns/:serviceName/:longName/:folderPath to get info about the content of a subfolder of a service

This is annoying because if you don't know the exact path to the file, you cannot discover it.