I have the following :
var uploadView = new google.picker.DocsUploadView().setIncludeFolders(true);
var picker = new google.picker.PickerBuilder().
addView(uploadView).
setOAuthToken(oauthToken).
setDeveloperKey(googleDeveloperKey).
setCallback(uploadPickerCallback).
build();
picker.setVisible(true);
In no place during the process does it ask for the destination, it just uploads to the root and closes the dialog once the file is done uploading.