Show your code anyway.

#!/usr/bin/perl --

use strict;
use warnings;

use Tree::Builder;
my $tb = Tree::Builder->new();

my @list = qw[
    /var/www/data/stuff
    /var/www
    /var/www/data/misc
    /var/logs
    /var/logs/data
];

$tb->add($_) for @list;

use Data::Dumper;
print Dumper( { $tb->getTree } );
__END__
$VAR1 = {
          '' => {
                  'var' => {
                             'www' => {
                                        'data' => {
                                                    'misc' => {},
                                                    'stuff' => {}
                                                  }
                                      },
                             'logs' => {
                                         'data' => {}
                                       }
                           }
                }
        };
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