This parameter specifies a set of UNIX mode bit
permissions that will always be set on a directory
created by Samba. This is done by bitwise 'OR'ing these bits onto the
mode bits of a directory that is being created. The default for this
parameter is (in octal) 0000 which will not add any extra permission
bits to a created directory. This operation is done after the mode
mask in the parameter directory mask is
applied.
The example below would force all created directories to have read and execute
permissions set for 'group' and 'other' as well as the
read/write/execute bits set for the 'user'.
000
0755
directory mask
inherit permissions