Gio.File.prototype.get_relative_path

function get_relative_path(descendant: Gio.File): String {
    // Gjs wrapper for g_file_get_relative_path()
}

Gets the path for descendant relative to parent.

This call does no blocking I/O.

descendant: input Gio.File
Returns: string with the relative path from descendant to parent, or null if descendant doesn't have parent as prefix. The returned string should be freed with GLib.free when no longer needed.