対象ディレクトリがシンボリックリンクだとエラー about files HOT 5 CLOSED

panic: runtime error: slice bounds out of range

goroutine 1 [running]:
main.main.func1.2(0xc82007e4fe, 0xb)
        /home/thinca/.go/src/github.com/mattn/files/files.go:200 +0x135
main.main()
        /home/thinca/.go/src/github.com/mattn/files/files.go:215 +0x9d2

goroutine 19 [runnable]:
syscall.Syscall6(0x101, 0xffffffffffffff9c, 0xc8200d2000, 0x80000, 0x0, 0x0, 0x0, 0x3, 0x80000, 0x0)
        /usr/lib/go/src/syscall/asm_linux_amd64.s:44 +0x5
syscall.openat(0xffffffffffffff9c, 0xc82007eb40, 0x29, 0x80000, 0x0, 0x0, 0x0, 0x0)
        /usr/lib/go/src/syscall/zsyscall_linux_amd64.go:40 +0xc8
syscall.Open(0xc82007eb40, 0x29, 0x80000, 0x0, 0x402733, 0x0, 0x0)
        /usr/lib/go/src/syscall/syscall_linux.go:51 +0x58
os.OpenFile(0xc82007eb40, 0x29, 0x0, 0xc800000000, 0xc8200d0000, 0x0, 0x0)
        /usr/lib/go/src/os/file_unix.go:93 +0xa3
os.Open(0xc82007eb40, 0x29, 0x7f491f569e28, 0x0, 0x0)
        /usr/lib/go/src/os/file.go:246 +0x48
path/filepath.readDirNames(0xc82007eb40, 0x29, 0x0, 0x0, 0x0, 0x0, 0x0)
        /usr/lib/go/src/path/filepath/path.go:402 +0x5b
path/filepath.walk(0xc82007eb40, 0x29, 0x7f491f37d390, 0xc8200d0000, 0xc820046f58, 0x0, 0x0)
        /usr/lib/go/src/path/filepath/path.go:361 +0x1a2
path/filepath.walk(0xc820074120, 0x1e, 0x7f491f37d390, 0xc820092140, 0xc820046f58, 0x0, 0x0)
        /usr/lib/go/src/path/filepath/path.go:374 +0x4fc
path/filepath.Walk(0xc820074120, 0x1e, 0xc820046f58, 0x0, 0x0)
        /usr/lib/go/src/path/filepath/path.go:396 +0xe1
main.filesSync.func1(0xc820074120, 0x1e, 0x7f491f379000, 0xc82007a7e0, 0xc820078120)
        /home/thinca/.go/src/github.com/mattn/files/files.go:41 +0x9f
created by main.filesSync
        /home/thinca/.go/src/github.com/mattn/files/files.go:77 +0x11e