/usr/share/vagrant/templates/nfs/exports.erb is in vagrant 1.0.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # VAGRANT-BEGIN: <%= uuid %>
<% folders.each do |name, opts| %>
"<%= opts[:hostpath] %>" <%= ip %><% if opts[:map_uid] -%> -mapall=<%= [opts[:map_uid],opts[:map_gid]].compact.join(":") %><% end -%>
<% end %>
# VAGRANT-END: <%= uuid %>
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