gvfs-smb does not support smb2 or later protocol

Nautilus uses gvfs-smb to access samba server shares.

But gvfs-smb support only smb1 protocol.
Our file server does not allow smb1 protocol for security.

So, i can't access file server by nautilus.
I tested with my machine my home.

First, my nas can set minimum version of smb protocol version.
I set my nas's protocol support range to minimim smb1 and maximum smb3.
My machine can access nas with nautilus by smb connection.

Second, i change minimum smb protocol to smb2.
Then, my nas cannot access my nas with nautilus.

Tested machine:

Description: Ubuntu 17.10
Release: 17.10

gvfs:
  Installed: 1.34.1-1ubuntu1
  Candidate: 1.34.1-1ubuntu1
  Version table:
 *** 1.34.1-1ubuntu1 500
        500 http://kr.archive.ubuntu.com/ubuntu artful/main amd64 Packages
        100 /var/lib/dpkg/status
nautilus:
  Installed: 1:3.26.0-0ubuntu1
  Candidate: 1:3.26.0-0ubuntu1
  Version table:
 *** 1:3.26.0-0ubuntu1 500
        500 http://kr.archive.ubuntu.com/ubuntu artful/main amd64 Packages
        100 /var/lib/dpkg/status

Tested NAS: Synology DS415 (shared folder can access for guest)