Install:
go get github.com/tseho/dconf-filter
see "Rules" for the rules file
dconf dump / | dconf-filter --rules=<RULES_PATH>
You need to provide a rules file using the gitignore syntax.
Eg:
org/gnome/shell
!org/gnome/shell/command-history
This exemple will whitelist all settings in org/gnome/shell/* except org/gnome/shell/command-history.
As git does with gitignore, the last matching rule will overwrite any previous match.