What path does UIDocumentPickerViewController expose the virtual filesystems at?

Say that I wanted to access a filesystem object (most probably a mere file or directory) at an application-specific virtual filesystem exposed by UIDocumentPickerViewController via the "Files" application, what path would that filesystem be mounted at? I presume that I could ascertain this by creating an application which: 1. ...accesses a file via the file picker screen (ignore the arrow; see the Google Drive "Drive" entrant above it): 1. ...and requests its path from the OS. However, I'm no Darwin software developer, and if I were, this'd be for SO, not here. I do occasionally have access to macOS, though, and have ascertained that on there, they're exposed at $HOME/Library/CloudStorage.