making GtkFileChooser allow directories only?

[William Dest <ddinbox1-william yahoo com>]

I want to allow the user to set a path or directory
which gets saved in the settings for the program.  I'd
like to use GtkFileChooser to show the directories and
let the user choose one, but is there a way to NOT
show the files in the directories, since they would
not be valid selections?

Thanks in advance, 

William Dest