Google Drive Picker: Show only top level folders

Question

Currently I am using google.picker.​ViewId.FOLDERS view in Google drive picker. This however, shows all the folders(including deep level folders) in my drive.

How to achieve a view in which only the top level folders are displayed at first? This would be similar to Dropbox chooser's file view.

Answer 1

For reference. This works fine now:

 let docsView = new google.picker.DocsView(google.picker.ViewId.FOLDERS)
                            .setParent('root')
                            .setSelectFolderEnabled(true);