I use 'include' paramter in a smb.conf to do test the Samba.
In some test case, [global] section appears in a smb.conf after [sharename]
section. However, Samba ignores service parameters in [global] section in this case.

For example, refere the following commands and outputs: 

$ cat smb.conf
[printer]
    printable = yes

[file]

[global]
    printing = sysv
    read only = no

$ testparm -s smb.conf
Load smb config files from smb.conf
Processing section "[printer]"
No path in service printer - using /tmp
Processing section "[file]"
No path in service file - using /tmp
Loaded services file OK.
# Global parameters
[global]
        read only = No
        printing = sysv

[printer]
        path = /tmp
        read only = Yes
        printable = Yes
        printing = bsd

[file]
        path = /tmp
        read only = Yes
        printing = bsd