Instead of doing a straightforward Get-Folder, you need to export the full path to the folder.
See my Get The Folderpath post.
See also Re: Export/Import Folder Structure
You will need to add the permissions to the export.Blog: http://lucd.info | Twitter: @LucD22 | PowerCLI Reference co-author: http://tinyurl.com/hkn4glz
I´m not that good in PowerCLI but I will check it how I get your part into the script I found.