I've seen this question asked here before and I noticed that the topic was posted on a popular domain name news site that I frequent so I figured I'd post it here.
Andrew gives a detailed description at DomainNameWire.com.
Solved! Go to Solution.
Thanks for sharing @justingodfrey!
Welcome to the Community!
If you are wanting to allow access to a developer, to the content of only one folder/website, you can provide them their own own FTP user name. These instructions will help you set it up.