"Neither the ext4 filesystem nor Samba 4 are ready for prime-time yet, but they are chock-full of promise and potential, so let's take a look at what they are promising to deliver.
"Linux supports all manner of file systems: ext2, ext3, JFS, XFS, ReiserFS, NTFS, FAT12/16/32 and many more. Look in your /boot/config-[kernel version] file under 'File systems' to see what's enabled in your kernel..."