FS_VNODE_CAPABILITY_IO
CLEAR_UNSUPPORTED(FS_VNODE_CAPABILITY_IO, io);
if (!HasVNodeCapability(vnode, FS_VNODE_CAPABILITY_IO))
fNodeCapabilities.Set(FS_VNODE_CAPABILITY_IO, true);
capabilities.Set(FS_VNODE_CAPABILITY_IO, ops->io);