what would be the fastest, best way to move data from a qtree to a parent volume.
Just mount volume and use host tool (simple "mv" should suffice - as this is NFS I assume you are using Unix/Linux) to move data. Hopefully you do not have large number of objects in top level directory.
You could also use the ndmpcopy command that is completed on the NetApp system and since does not require a host should be faster. Please see page 23 of the Data Protection Tape Backup and Recovery Guide...
The ndmpcopy command transfers data between storage systems that support NDMP v4. You can perform both full and incremental data transfers. Incremental transfers are limited to a maximum of two levels (one full and up to two incremental backups). You can transfer full or partial volumes, qtrees, directories, or individual files.