"WinBtrfs is a Windows driver for the next-generation Linux filesystem Btrfs. A reimplementation from scratch, it contains no code from the Linux kernel, and should work on any version from Windows XP onwards. It is also included as part of the free operating system ReactOS."
Not sure what point you're making here. WinBtrfs is a driver for the same btrfs filesystem that Linux uses. It's most common use case is reading the Linux partitions in Windows on machines that dual-boot both operating systems
"WinBtrfs is a Windows driver for the next-generation Linux filesystem Btrfs. A reimplementation from scratch, it contains no code from the Linux kernel, and should work on any version from Windows XP onwards. It is also included as part of the free operating system ReactOS."
This is from the ntfs2btrfs maintainer's page.
https://github.com/maharmstone/btrfs