How to share a data partition with a KVM virtual machine?

Hi. This is my first attempt at virtual machines.

I want to host Windows 10 on Fedora 34 KVM.
There will also be a separate data partition accessible to both operating systems.

I have some questions about sharing the data partition:

  1. Does the data partition need to be NTFS for Windows?
  2. If Samba is used for file sharing, could Windows and Fedora both access the same Btrfs data partition?
  3. If 9p virtio is used for file sharing, could Windows and Fedora both access the same Btrfs data partition?
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Both Samba and Virtio/9p should work with Btrfs.
Better not use NTFS, unless you plan to share it from the guest.