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Why not pass it the pinfo that was passed into your dissector?

10.3. Example: Dissector written in Lua

function p_multi.dissector(buf, pkt, tree)
...
        if dissector ~= nil then
                -- Dissector was found, invoke subdissector with a new Tvb,
                -- created from the current buffer (skipping first two bytes).
                dissector:call(buf(2):tvb(), pkt, tree)

Guacamole Dissector - guacp-postdissector.lua

function guacp_post.dissector(tvbuf, pinfo, tree)
...
    guacp_dissector:call(guacp_tvb:tvb(), pinfo, tree)