Initial checkin from CRI-O repo

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

vendor/github.com/containers/storage/drivers/driver_freebsd.go

@@ -0,0 +1,23 @@
+package graphdriver
+
+import (
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+var (
+	// Slice of drivers that should be used in an order
+	priority = []string{
+		"zfs",
+	}
+)
+
+// Mounted checks if the given path is mounted as the fs type
+func Mounted(fsType FsMagic, mountPath string) (bool, error) {
+	var buf unix.Statfs_t
+	if err := syscall.Statfs(mountPath, &buf); err != nil {
+		return false, err
+	}
+	return FsMagic(buf.Type) == fsType, nil
+}