How efficient is a file move on the same fileshare?

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http://serverfault.com – From a windows208r2 client connected to a SMB/CIFS share, I move a file from one directory to another directory on the same network share. Does windows send a "move" command to the share, or does windows copy the bytes locally, write them to the new location on the same share in the new location, and then delete the original file? One would be much more efficient than the other, just don't know how "smart" the client/server is for this type of share. (HowTos)