[CentOS] Preventing a user from moving "up" directories

I am in the process of setting up a new server.  In the process I cannot 
remember what I need to set so that an FTP user cannot move upward in 
the directory tree of the user's directory.  The FTP server is VSFTP.  
The user's directory is owned by the user and the permissions are 775.

Isn't there a setting in httpd.conf to prevent that?

Todd

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