Feature Request: Add support for setting permissions (umask) during mount

[juangarant]

Hi, I'm using onedriver to mount my OneDrive on Linux, and I need to set specific permissions for all synchronized files and folders. Currently, there's no way to do this during the mount process, and manually changing permissions recursively is slow and inefficient.

It would be great if onedriver could support a --umask option (or similar) to set default permissions when mounting the filesystem. This is a common feature in other FUSE-based tools like rclone.

Thanks for considering this feature!