I have the same problem as the bug report in

amanda-client: NT_STATUS_ACCESS_DENIED causes SMB backup to fail completely rather than report warnings after upgrade - https://lists.debian.org/debian-qa-packages/2013/06/msg00290.html

The AMANDA version is 3.3.6-4.1 and the smbclient version is 4.3.3.

Code:
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup: pid 5826 ruid 34 euid 34 version 3.3.6: start at Fri Jan  8 12:26:34 2016
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup: Version 3.3.6
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup: pid 5826 ruid 34 euid 34 version 3.3.6: rename at Fri Jan  8 12:26:34 2016
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup:   Parsed request as: program `GNUTAR'
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup:                      disk `//monster.somesoftsoft.de/dev'
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup:                      device `//monster.somesoftsoft.de/dev'
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup:                      level 0
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup:                      since NODATE
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup:                      options `'
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup:                      datapath `AMANDA'
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup: start: localhost://monster.qudosoft.de/dev lev 0
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup: gnutar: backup of \\monster.qudosoft.de\dev
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup: Spawning "/usr/bin/smbclient smbclient "\\\\monster.somesoftsoft.de\\dev" -U backup -E -d0 -Tqca -" in pipeline
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup: gnutar: /usr/bin/smbclient: pid 5841
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup: Started backup
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup: Started index creator: "/bin/tar -tf - 2>/dev/null | sed -e 's/^\.//'"
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup: 114:  normal(|): Domain=[QUDOSOFT] OS=[Unix] Server=[Samba 3.6.24]
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup: 118: strange(?): cli_setatr failed: NT_STATUS_ACCESS_DENIED
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup: 118: strange(?): tar:712  Total bytes received: 8196
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup: Index created successfully
Fri Jan  8 12:26:34 2016: thd-0x56471b51d000: sendbackup: critical (fatal): error [no backup size line
Any way to circumvent the SMB backup to fail completely rather than report warnings after upgrade?