[Samba] problems with samba shares

[Hans Sachs]

Hello,

since last friday (2017-09-22) we have problems with samba shares
outside user home - at 2017-09-21 works all things fine - and no
changes at smb.conf or filesystem.

Version: samba-3.6.23-45.el6_9.x86_64
Linux: Scientific Linux release 6.9 / 2.6.32-696.10.2.el6.x86_64

Problem:
the users can open the samba share and see all files and directories in
topmost level, but he can change into a subfolder or better he get non
error message to open the subfolder, but he can see no content

Hans