Robocopy isn't really designed to do that easily. However, there is a way.
Root folder contains lets say 50 files and 40 folders. You only want folder X (but you also want it's time and date stamp).
ROBOCOPY c:\ d:\ /XF 50 root file names c:\boot.ini c:\bla.txt etc. /XD c:\windows c:\drivers c:\temp etc. /S /E /SEC /DCOPY:T
The /DCOPY:T tells it to keep the folder time stamps. The /XF specifies which files NOT to copy, /XD specifies which folders to NOT copy. Just don't specify folder c:\X.
The main drawback to this is researching all the folders and file names in the root and specifically calling them all here. If you are doing this a lot on different systems a script could be written.
robocopy c:\testing c:\abc /XF c:\testing\Testing.txt /XD "C:\testing\New Folder (2)" "C:\testing\New Folder (3)" /S /E /SEC /DCOPY:T
Root Working Example
robocopy c:\ d:\ /XF c:\Testing.txt /XD "C:\New Folder (2)" "C:\New Folder (3)" /S /E /SEC /DCOPY:T
My test worked, I create a few folders and sub folders, c:\testing was root in this case, c:\abc was root of another drive (obviously they aren't really, but for this purpose it should make sense). The folder I wanted from the root was called "New Folder", as you can see I did not specify it in the /XD. Also, make sure you specify the c:\ or the names you use will be global. In other words if I didn't specify c:\testing in from of the Testing.txt file, it would omit it from ALL of the subfolders being copied. The /SEC will copy all the file security and time stamps.