hr_multi_company_employee/security/hr_security.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data noupdate="0">
        <record id="hr.hr_employee_comp_rule" model="ir.rule">
            <field name="name">Employee multi branch rule</field>
            <field name="model_id" ref="hr.model_hr_employee"/>
            <field name="global" eval="True"/>
            <field name="domain_force">['|', ('company_ids', '=', False), ('company_ids', 'in', company_ids)]</field>
        </record>
    </data>
</odoo>