I have setup 4 reproducer VMs. All running the base OS and installed
only required packages for Samba. Here are the results:

SMBClient               Xenial  Yakkety Zesty   Artful
Link to root            Y       Y       Y       Y
Link to directory       Y       Y       Y       Y
Link to file            N       N       N       N

* On Link to file via smbclient, error given is: 
NT_STATUS_ACCESS_DENIED opening remote file \opt\smb.conf

Windows                 Xenial  Yakkety Zesty   Artful
Link to root            Y       N       N       N
Link to directory       N       N       N       N
Link to file            N       N       N       N

* On Link to root on Windows, the “N” gives error “The directory name is
invalid”

Version of Samba on each is:
Xenial  4.3.11+dfsg-0ubuntu0.16.04.7
Yakkety 4.4.5+dfsg-2ubuntu5.6
Zesty   4.5.8+dfsg-0ubuntu0.17.04.2
Artful  4.5.8+dfsg-2ubuntu3

Artful was daily iso downloaded from here on 6/28/2017:
http://cdimage.ubuntu.com/ubuntu-server/daily/current/artful-server-amd64.iso
MD5Sum: ad2f3ef5db99cf91a34903fa61a0c2f2

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https://bugs.launchpad.net/bugs/1701073

Title:
  CVE-2017-2619 regression breaks symlinks

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